https://issues.apache.org/bugzilla/show_bug.cgi?id=54440

            Bug ID: 54440
           Summary: TagPluginManager.init() throws NPE when used in Ant
                    <jasper> task
           Product: Tomcat 7
           Version: 7.0.35
          Hardware: Macintosh
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Jasper
          Assignee: dev@tomcat.apache.org
          Reporter: sro...@apache.org
    Classification: Unclassified

In 7.0.35, I see the following NPE when compiling JSPX files via the <jasper>
Ant task:

   [jasper] java.lang.NullPointerException
   [jasper]     at
org.apache.jasper.compiler.TagPluginManager.init(TagPluginManager.java:83)
   [jasper]     at
org.apache.jasper.compiler.TagPluginManager.apply(TagPluginManager.java:57)
   [jasper]     at
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:240)
   [jasper]     at
org.apache.jasper.compiler.Compiler.compile(Compiler.java:373)
   [jasper]     at org.apache.jasper.JspC.processFile(JspC.java:1179)
   [jasper]     at org.apache.jasper.JspC.execute(JspC.java:1329)
   [jasper]     at
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
   [jasper]     at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
   [jasper]     at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   [jasper]     at java.lang.reflect.Method.invoke(Method.java:601)
   [jasper]     at
org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
   [jasper]     at org.apache.tools.ant.Task.perform(Task.java:348)
   [jasper]     at org.apache.tools.ant.Target.execute(Target.java:390)
   [jasper]     at org.apache.tools.ant.Target.performTasks(Target.java:411)
   [jasper]     at
org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)
   [jasper]     at
org.apache.tools.ant.Project.executeTarget(Project.java:1368)
   [jasper]     at
org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
   [jasper]     at
org.apache.tools.ant.Project.executeTargets(Project.java:1251)
   [jasper]     at org.apache.tools.ant.Main.runBuild(Main.java:809)
   [jasper]     at org.apache.tools.ant.Main.startAnt(Main.java:217)
   [jasper]     at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)
   [jasper]     at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)

This didn't happen in 7.0.34.

Given the line and change from 7.0.34
(http://svn.apache.org/viewvc/tomcat/tc7.0.x/trunk/java/org/apache/jasper/compiler/TagPluginManager.java?r1=1402119&r2=1431228&diff_format=h)
I assume that in...

    urls = ctxt.getClassLoader().getResources(
84                              META_INF_JASPER_TAG_PLUGINS_XML);

the ClassLoader is null, since ctxt was used here before and evidently not
null.

Fall back to Thread.currentThread().getContextClassLoader() in this case?


My Ant snippet:

    <import file="${tomcat.home}/bin/catalina-tasks.xml"/>
    ...
    <jasper validateXml="false"
            failonerror="true"
            listerrors="true"
            trimspaces="true"
            uriroot="${module.web.basedir}/docs"
            outputDir="${module.web.basedir}/gen"
            package="*****"
            xpoweredBy="false"/>

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